Fabrication of high-performance graphene oxide/CuO/Cu2O film-coated copper foam for interfacial solar-driven water evaporation

Reduced graphene oxide is an excellent candidate for various electronic devices such as high performance gas sensors. In this work Graphene oxide was prepared by oxidizing graphite to form graphite oxide. From XRD analysis the peak around 11.5o confirmed that the oxygen was intercalated into graphite. By using hydrazine hydrate, the epoxy group in graphite oxide was reduced then the solution of reduced graphite oxide (rGO) is exfoliated. Raman spectrum of rGO contains both G band (1580 cm-1), D band (1350 cm-1). The remarkable structural changes reveals that reduction of graphene oxide from the values of ID/IG ratio that increase from 0.727 (GO) to 1.414 (rGO). The exfoliated reduced graphite oxide solution is spin coated on to the SiO2/Si substrates.

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Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

Scientific Reports ◽

10.1038/s41598-021-81759-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Jeongpil Kim ◽

Jeong-Hyun Eum ◽

Junhyeok Kang ◽

Ohchan Kwon ◽

Hansung Kim ◽

...

Keyword(s):

Graphene Oxide ◽

Pore Structure ◽

Specific Capacitance ◽

Surface Area ◽

Thermal Annealing ◽

High Performance ◽

Annealing Process ◽

Supercapacitor Electrode ◽

Simple Method ◽

Surface Areas

AbstractHerein, we introduce a simple method to prepare hierarchical graphene with a tunable pore structure by activating graphene oxide (GO) with a two-step thermal annealing process. First, GO was treated at 600 °C by rapid thermal annealing in air, followed by subsequent thermal annealing in N2. The prepared graphene powder comprised abundant slit nanopores and micropores, showing a large specific surface area of 653.2 m2/g with a microporous surface area of 367.2 m2/g under optimized conditions. The pore structure was easily tunable by controlling the oxidation degree of GO and by the second annealing process. When the graphene powder was used as the supercapacitor electrode, a specific capacitance of 372.1 F/g was achieved at 0.5 A/g in 1 M H2SO4 electrolyte, which is a significantly enhanced value compared to that obtained using activated carbon and commercial reduced GO. The performance of the supercapacitor was highly stable, showing 103.8% retention of specific capacitance after 10,000 cycles at 10 A/g. The influence of pore structure on the supercapacitor performance was systematically investigated by varying the ratio of micro- and external surface areas of graphene.

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Metal-organic framework derived metal oxide/reduced graphene oxide nanocomposite, a new tool for the determination of dipyridamole

New Journal of Chemistry ◽

10.1039/d0nj05329e ◽

2021 ◽

Author(s):

Naeime Salandari-Jolge ◽

Ali A. Ensafi ◽

Behzad Rezaei

Keyword(s):

Myocardial Infarction ◽

Graphene Oxide ◽

High Performance ◽

High Selectivity ◽

Low Cost ◽

Metal Organic Framework ◽

Heart Patients ◽

Reduced Graphene ◽

Metal Organic

Dipyridamole is a prescribed medication used to treat cardiovascular diseases, angina pectoris, imaging tests for heart patients, and myocardial infarction. Therefore, high selectivity and sensitivity, low cost, and high-performance speed...

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Three-dimensional reduced graphene oxide decorated with iron oxide nanoparticles as efficient active material for high performance capacitive deionization electrodes

Chemical Engineering Journal Advances ◽

10.1016/j.ceja.2021.100094 ◽

2021 ◽

Vol 6 ◽

pp. 100094

Author(s):

Yolanda Belaustegui ◽

Inés Rincón ◽

Francisco Fernández-Carretero ◽

Patxi Azpiroz ◽

Alberto García-Luís ◽

...

Keyword(s):

Graphene Oxide ◽

Iron Oxide ◽

Reduced Graphene Oxide ◽

Iron Oxide Nanoparticles ◽

High Performance ◽

Active Material ◽

Three Dimensional ◽

Oxide Nanoparticles ◽

Capacitive Deionization ◽

Reduced Graphene

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Green and facile preparation of graphene/resveratrol/polyaniline composites for high-performance supercapacitors

New Journal of Chemistry ◽

10.1039/d0nj04739b ◽

2021 ◽

Vol 45 (7) ◽

pp. 3581-3588

Author(s):

Zhaokun Wang ◽

Licong Jiang ◽

Hongwei Pan ◽

Yongyin Cui ◽

Chengzhong Zong

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

High Performance ◽

Environmentally Friendly ◽

Reduced Graphene ◽

Facile Preparation ◽

Polyaniline Composites

A novel and environmentally-friendly resveratrol (RA) was used as an effective reagent for the preparation of reduced graphene oxide (rGO).

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High-Performance Graphene Coating on Titanium Bipolar Plates in Fuel Cells via Cathodic Electrophoretic Deposition

Coatings ◽

10.3390/coatings11040437 ◽

2021 ◽

Vol 11 (4) ◽

pp. 437

Author(s):

Yi Liu ◽

Luofu Min ◽

Wen Zhang ◽

Yuxin Wang

Keyword(s):

Graphene Oxide ◽

Fuel Cells ◽

Electrophoretic Deposition ◽

High Performance ◽

Proton Exchange Membrane ◽

Corrosion Current ◽

Proton Exchange ◽

Bipolar Plates ◽

Modified Graphene Oxide ◽

Bare Titanium

In this article, we proposed a facile method to electrophoretically deposit a highly conductive and corrosion-resistant graphene layer on metal bipolar plates (BPs) while avoiding the oxidation of the metal substrate during the electrophoretic deposition (EPD). p-Phenylenediamine (PPD) was first grafted onto negatively charged graphene oxide (GO) to obtain modified graphene oxide (MGO) while bearing positive charges. Then, MGO dispersed in ethanol was coated on titanium plates via cathodic EPD under a constant voltage, followed by reducing the deposited MGO with H2 at 400 °C, gaining a titanium plate coated with reduced MGO (RMGO@Ti). Under the simulated environment of proton exchange membrane fuel cells (PEMFCs), RMGO@Ti presents a corrosion current of < 10−6 A·cm−2, approximately two orders of magnitude lower than that of bare titanium. Furthermore, the interfacial contact resistance (ICR) of RMGO@Ti is as low as 4 mΩ·cm2, which is about one-thirtieth that of bare titanium. Therefore, RMGO@Ti appears very promising for use as BP in PEMFCs.

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